Trade name FC-248 Chemical name Tetraethylammonium perfluorooctanesulfonate CAS No.: 56773-42-3 Molecular formula CF3(CF2)7SO3-(C2H5)4N+ Molecular formula C16H20F17NSO3 Molecular weight 629 Assay 90% Appearance White powder Surface tension 22mN/m(0.1% aqueous solution)